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Displacement Time Diagram Pneumatic Controls

Principle of a displacement time diagram

Unlike in the displacement step diagram, a displacement time diagram illustrates the sequence of movements plotted not against step number but against real time t. This representation therefore shows not only the sequence of movements initiated by the controller but also how long each step takes.

Example: drilling machine

The following animation once again shows schematically the arrangement of a drilling machine as in the previous section. In this case, however, the vertical cylinder M2 extends and retracts much more quickly than the clamping cylinder M1 (about twice as fast).

displacement-time-disgram-animation.gif

The displacement step diagram in this case is identical to that in the previous section since the sequence of events is unaltered. The higher speed of cylinder M2 becomes apparent, however, in the displacement time diagram below.

displacement-time-diagram-graph.jpg

The sequence of movements of the two cylinders is now plotted against time t. The step number is still indicated at the top of the diagram. The representation clearly shows that steps 2 and 3 (i.e. extension and retraction of cylinder M2) are much shorter in duration than steps 1 and 4 (extension and retraction of cylinder M1). The displacement time diagram thus gives more information than the displacement step diagram regarding the duration of the individual steps.

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